US2002220A - Swaging means - Google Patents

Description

H. A. DOUGLAS SWAGING MEANS May2l, 1935.

Fiiled Dec. 29, 1932 3 Sheets-Sheet 1 CZ D01 9 y 1935- H. A. DOUGLAS 2,002,220

SWAGING MEANS FiledDec. 29, 1932 3 Sheets-Sheet 2 f'zz/erzf or gar?" 62.201 2616- J MIA/Mm y 1935- H. A. DOUGLAS 2,002,220

SWAGING MEANS Filed Dec. 29, 1932 5 Sheets-Sheet 3 Patented May 21, 1935 UNITED STATES PATENT OFFICE 13 Claims.

This invention relates to swaging machines more particularly for producing terminal and wire couplings for electrical conductors;

Among other objects, the invention aims to provide an improved and simplified means for producing by swaging or compression, 9. coupling between a metallic terminal and a current conducting wire, in which the terminal is so joined to the wire as to reduce the voltage drop therebetween substantially to zero.

Another important object of the invention is to provide a coupling between the wire and the terminal without the use of solder, which at the same time will be stronger and more flexible than connections produced with solder, and which is not liable to deterioration or disconnection.

My invention is inclusive of automatic means for regulating the pressure applied so that not only the terminal but the wire as well is sufiiciently compressed to almost fuse the terminal and wire together while at the same time stopping short of breaking or weakening the parts.

This application is a continuation in part of my copending application, Serial No. 602,912, filed April 4, 1932, entitled Method of producing wire terminals.

The invention will be more fully explained by reference to the illustrative constructions shown in the accompanying drawings in which- Figure 1 shows in elevation a coupling produced by the use of my invention and associated with one conventional circuit continuing device, shown largely in cross-section;

Figure 2 is a view somewhat reduced, of the plug and the wire for which it is to constitute a terminal, in separated relation, this view indicating a preliminary step in the practice of the invention, a portion of means for compressing the plug being diagrammatically indicated in dotted lines;

Figure 3 is an axial section of the plug of Figure 2, but showing a terminal and wire in proper relation to be swaged;

Figure 4 is an enlarged cross-section taken on the line 4-4 of Figure 3;

Figure 5 is a view similar to Figure 4, but indicating an intermediate stage in the production of the improved coupling, the operation of the swaging members being indicated somewhat diagrammatically;

Figu1'e6 is a view similar to Figures 4 and 5, but indicating a still later stage;

Figure '7 is a view similar to Figures 4, 5, and 6, but indicating the final stage in the production of the wire and terminal coupling, and is a crosssection taken on the line 'l'! of Figure 8;

Figure 8 is an axial section of the plug, with the wire shown in elevation, showing the completed coupling, and is a section taken on the line 8-8 of Figure '7, reduced to the scale oi Figures 2 and 3;

Figure 8a. is a view similar to Figure 8 illustrating use of a solid wire;

Figure 8b is a cross section taken on the line 8b-8b of Figure 8a;

Figure 9 is a front elevation, partially in section, showing illustrative mechanism for practicing the invention;

Figure 10 is a side elevation of the mechanism of Figure 9 with parts being shown in section;

Figure 11 is a cross-section taken on the line ll--ll of Figure 9 on a larger scale;

Figure 12 is a vertical section taken on the line l2-I2 of Figure 11;

Figure 13 is a front elevation of the structure of Figure 11, showing one operative position of the parts;

Figure 14 is a section taken on the line ll-H of Figure 11, showing parts broken away and indicating a difierent operative position of the mechanism from the position shown in Figure 13;

Figure 15 is a partial section taken on the line l5l5 of Figure 13;

Figure 16 is a perspective view of an illustrative swaging member;

Figure 17 is an enlarged section of a portion of the structure of Figure 9, parts being shown in elevation;

Figure 18 is a partial section on a somewhat reduced scale, similar to Figure 11 but showing another type of terminal being swaged;

Figure 19 is a perspective view of this latter type terminal shown in cross-section in Figure 18; and

Figure 20 is a side elevational view showing the two types of terminals illustrated, associated together to form a line connection.

In the illustrative construction shown in Figures 1 to 8, I have shown a generally cylindrical metallic plug I adapted to form a terminal for the current conducting wire 2 which generally carries the insulation 3. The plug l is preferably formed with a straight shank portion 4 and a tapered tip portion 5. Referring particularly to Figure 3, the plug I is desirably first bored axially throughout its entire length as at 6, to receive the bared end of the wire 2 stripped of the insulation 3. The bore 6 is desirably counterbored as at I, to permit a portion of the wire 2 with insulation thereon to be received in the shank portion 4 of the plug to an extent that the end of the wire 2 is substantially flush with the end of the tip 5 of the plug.

In this instance the wire 2 is stranded and is composed of the metallic strands 8, but the wire may be a solid wire, such as the wire 2a shown in Figures 8a and 8b. As shown in the cross-sectional view Figure 4, when the wire 2 is first inserted in the bore 6 of the plug I, as shown in-Figure 3, each of the strands 8 is substantially cylindrical, leaving interstices between the strands themselves and between the strands and the wall of the bore 6. In accordance with my invention, I swage the metal of the plug and the metal of the strands 8 so that these interstices are substantially eliminated.

In Figure 5 I have shown a preferred next stage in the illustrative process to produce ,a swaged terminal, in which the plug I is engaged by swaging members such as the jaws 9, in this instance four in number, arranged ninety degrees apart about the axis of the plug, the oppositely disposed jaws constituting pairs. When moved centripetally, i. e. toward the axis of the plug, the jaws 9 force portions of the wall In of the plug I inwardly toward the bore 6, so that the bore is somewhat reduced in cross-sectional area as at II.

In the illustrative construction the jaws 9 are desirably V-shape as shown, and produce the V-shape indentations 9a in the tip 5 of the plug I, so that the reduced bore II tends to assume a square cross-sectional configuration, and this configuration is accentuated as the jaws 9 move further inwardly to cause the plug at the point engaged by the jaws to assume the cross-sectional appearance shown in Figure 6, in which condition the strands 8 of the wire 2 receive in the bore 6 of the plug have been forced closer together than in the condition of Figures 4 and 5 and interengaging shoulders have begun to form between the plug and wire. As the jaws 9 arrive at the limit of their movement centripetally of the plug I, as shown in Figure 7, the bore of the plug in the region of engagement of the plug with the jaws has assumed the cross-section I2, so that both the wire and the terminal are substantially compressed and practically forced together, since the effective cross-sectional area of the bore has been substantially reduced from that of Figure 4. This substantial reduction is made possible in part by the V-shape jaws which permit the metal at the corners of the reduced bore at I2 to fold together, as at I3, thus enhancing the reduction of the bore. Also the strands 8, which in the step shown in Figures 5 and 6 were forced closer together, next, as shown in Figure '7, have their available crosssectional area of occupancy so reduced that they are deformed from their original circular crosssection and are forced to assume a substantially square cross-section, as shown at I4, thus practically eliminating interstices between the strands themselves and between the strands and the deformed walls I5 of the bore at I2. This substantially square cross-section which is given the bore and the strands, in accordance with my invention, practically eliminates air spaces between the strands themselves and between the strands and the wall of the bore, so that the entry of moisture therebetween is prevented and the voltage drop between the wire 2 and the plug I is reduced substantially to zero. At the same time, I obtain a practically fused metal-to-metal contact between the wire and the plug and the necessity of solder is entirely eliminated. Thus I obtain a much stronger and more flexible connection between the wire and the plug than is possible with any means employing solder.

I will next describe one illustrative mechanism for controlling the jaws described above. In Figures 9 and 10 I have shown a suitable machine for receiving and maintaining in position the plug I with the wire2inserted therein, and means for guiding and forcing the jaws 9 inwardly of the plug as described, together with means for limiting the inward movement of the jaws for a purpose described.

As here shown, the tapered tip 5 of the plug I, with the wire 2 therein, is inserted through a circular aperture I8 in the guide plate II. The aperture I6 has its diameter slightly reduced from front to rear of the plate I1, as at I8, so as snugly to receive the tapered outer end of the tapered tip 5 and limit the extent of insertion of the tip in the aperture I6. The guide plate I! may be secured by tap bolts I8b and centering pins I8a to a cylinder I9, which is fixed in a housing 28. The housing 20 may have ears 28a through which may pass a bolt 28b by tightening which the housing may be clamped about the cylinder I9 and thus firmly secure the cylinder in the housing. To further insure against rotation of the cylinder I9 in the housing 20 these parts may be keyed together as at 280.

In this instance each of the jaws 9 is in the form of a generally oblong block of metal as shown in Figure 16. These jaws are reciprocably received in radial grooves 22 in the cylindrical face 23 of the cylinder I9. The grooves 22 are desirably undercut, as at 24, to receive the feather portions 25 of the jaws 9, thus preventing the jaws from being displaced laterally of the grooves 22. As already mentioned, the portions of the jaws 9 which engage the plug I desirably have a V-edge, as indicated at 26, the sides of the V being in a plane parallel to the plate I! and therefore in a plane perpendicular to the axis of the plug I. These V-shaped terminations 26 of the jaws 9 are reduced in thickness, are somewhat ofiset outwardly of the grooves 22, and are received in guide grooves 21 in the plate I! which mate with the grooves 22 in the face 23. The V-shape terminations 26 are thus directed toward the plug I when the plug is inserted in the aperture I6, and tend to converge at a point which is coincident with the axis of the plug I, the V-shape terminations being complementary and forming complementary sectors, or in this instance, quadrants of a circle in a plane perpendicular to the axis of the plug.

To force the jaws 9 inwardly in this manner and against the plug I when located in the aperture I5, I provide actuating means which in this instance is foot operated by a treadle partially shown at 28 and suitably pivoted at 29 for example, on the floor of a factory. A yoke 30 is pivoted to the lever 28 as at 3|, and receives between its sides, held by a nut 32, a power transmitting member such as the threaded rod 33. Another and oppositely threaded rod 34 is connected with the rod 33 by a conventional turn-buckle 35 by which the combined length of the rods 33 and 34 may be reduced or increased, as desired, to control the angle of the lever 28 with respect to the floor, The position of the turn-buckle 35 when adjusted may be fixedly maintained by a lock nut 35. The rod 34 is passed through a spring barrel 31 which in turn may pass through a bench 38 upon which is mounted the pedestal 2| which supports the housing 20. The spring barrel 3! is desirably carried by the pedestal 2| by means of an extension 39 of the pedestal which receives the upper end of the spring barrel, and the spring barrel is provided with a retaining lip 49.

Bottomed in the spring barrel 31 is a coil spring 4| which surrounds the rod 34 and abuts at its upper end a. threaded cylindrical block 42 which receives the upper end of the rod 34 as best shown in Figure 17. A transverse pin 43 passing through the block 42 and rod 34 may fix the relationship of these parts. Thus arranged, the coil spring 4| urges the block 42 and rod 34 upwardly.

The block 42 is also exteriorly threaded as at 45 to receive thereover the internally threaded sleeve 44. The sleeve 44 houses a plunger 41 which has a head 48 fitting loosely in the sleeve 44 and providing an abutment for one end of the coil spring 49 which also is housed by the sleeve 44 and abuts at its other end against the closed top of the sleeve. The plunger head 48 may be secured to the plunger 41 by a transverse retaining pin 46. The plunger 41 is movable in the sleeve 44 against the action of the spring 49, and to guide the plunger 41 in its movement it desirably has riveted to its free end guide pins 59 which are snugly but slidingly received in axial recesses in the block 42. The plunger 41 passes upwardly through the sleeve 44 and is secured at its upper end to a yoke 52 as, for example, by a transverse pin 53 passing through the yoke 52 and plunger 41. The yoke 52 pivotally embraces an arm 54, articulated thereto by a pivot pin 54a.

The arm 54 actuates camming mechanism which moves the jaws centripetally. As here shown the arm 54 is integral with a rotatable annulus 55 which surrounds the fixed cylinder l9 and a rotatable cylindrical cam 56. The cam member 56 may be secured to the annulus 55, as by tap screws 51, to rotate with the annulus 55 upon movement of the arm 54. The inner face or periphery of the cam 56 is provided with tangential cam surfaces 58 terminating in recesses 59 in the inner face of the cam. In the present construction there are four of these recesses spaced apart ninety degrees about the axis of the cam 56 and each receiving in one position of the cam 56 an outer end of one of the jaws 9. The outer ends of the jaws are desirably beveled as at 68 to slide smoothly over the cam surfaces 58. It ill be understood that the jaws 9 are located in the face 23 of the cylnder l9 which is fixed against rotation with respect to the cam 56. Thus as the arm 54, by depression of the pedal 28, is moved from the position shown in Figure 13 to or toward the position shown in Figure 14, the cam 56 is rotated, and the outer ends of the jaws 9 are forced out of the recesses 59 and ride up the tangential cam surfaces 58, and the jaws are thus forced centripetally to engage the plug I and produce the indentations 9a therein, as already described. A shoulder 55a on the cylinder l 9 retains the annulus 55 in rotative position on the cylinder.

So constructed and arranged, I have provided a connection between the treadle 28 and the arm 54 by which when the treadle 28 is depressed, as for example by the foot of an operator, the arm 54 is moved downwardly against the action of the coil spring 4|, which, in turn, restores the arm to its uppermost position when the pressure of the foot is released. I have also provided an plunger 41, and coil spring 49, which is in the nature of a lost motion connection.

The operation of this extensible connection 7 is as follows: As the treadle 28 is depressed, the jaws 9 move centripetally or inwardly in proportion to the distance which the treadle is moved downwardly, until a predetermined resistance is encountered by the jaws. When the jaws encounter a predetermined resistance from the plug l, and while the treadle 28 is still being moved downwardly by the foot of the operator, the spring 49 yields and is compressed to permit relative movement between the plunger 41 and the sleeve 44, tending to separate the plunger from the block 42 and extending the connection between the treadle and the jaws. Thus, provided the spring 49 is not fully compressed, no more pressure can be placed upon the plug l than the counter-pressure of the spring 49. In this instance I provide that the block 42 shall strike the extension or stop 39 before the plunger 41 and sleeve 44 would normally move a suflicient distance relatively to fully compress the spring 49, and preferably before the jaws have moved to their extreme innermost position as shown in Figure 14. Obviously, the block 42 also strikes the stop 39 before the treadle 28 strikes the floor.

By this arrangement a predetermined pressure is automatically placed upon the plugs l, independent of the pressure applied by the operator, provided only that the operator moves the treadle downwardly a sufficient distance to cause the block 42 to strike the stop 39. Consequently, if the resistance encountered by the jaws 9 from plug l and wire received therein is slightly greater in a given instance than in another, the jaws will move together a less distance to compensate for the greater resistance. Thus the mechanism automatically compensates for slight variations in the bores of the plugs or in the diameters of the wires received therein. For example, if the bore of the plug is relatively large with respect to the diameter of the wire received therein, the resistance offered will be less than if the wire were received in the bore more snugly, and since the predetermined pressure is uniform, the jaws 9 will move inwardly a relatively greater distance to sufficiently reduce the bore of the plug to suitably deform the wire and efl'ect the practically fused metal-to-metal coupling already described.

By rotative adjustment of the sleeve 44 with respect to the block 42, the pressure of the spring 49 may be varied to effect the desired predetermined pressure upon the plugs. For example, if the sleeve and block are moved in a direction toward each other, the counter-pressure offered by the spring 49 will be increased so that the jaws will move inwardly a greater distance for a given resistance encountered, and conversely if the sleeve and block are moved relatively in the opposite direction. Thus I assure a predetermined pressure on the plugs and wire which will sufliciently compress them to effect a secure coupling but will not be suflicient to break or weaken the plug or wire, this desirable result being obtained automatically by the inherent operation of the mechanism described.

To automatically restore the jaws 9 to their outermost position, when the arm 54 is moved back to the position shown in Figures 9 and 13, by the action of the spring 4!, I may provide relatively light compression springs 8| received in radial bores 62 in the fixed cylinder I 9 parallel to the grooves 22 in face 23 of this cylinder. Fingers represented by the pins 63 fixed to the jaws 9, as by being each received in a hole 63a in each of the jaws 9, compress the springs GI when the jaws are moved inwardly, and these springs thereby restore the jaws to their outermost position in the recesses 59 when the pressure upon the jaws is relieved. The pins 63 may slide in slots 64 which connect the grooves with the recesses 62.

Theterminal so provided for the wire 2 by the plug I may be assembled with a circuit continuing device such as one which includes the block 65 (Figure 1) which in turn may be appropriately secured to an insulating mounting B6. The plug I is received in a cylindrical aperture 61 in the block 65 and the plug is pressed to one side of this aperture by a strong coil spring 68 through the intermediation of a detent 69 carriedby the block. To enhance the area of contact between the plug I and the block 65, the plug may have two spaced apart contacting surfaces, one represented by the shank portion 4 of the plug and the other by a similar cylindrical portion 10. The spring 68 presses both the shank portion 4 and the cylindrical portion 10 against one wall of the aperture 61 and as so constructed and arranged the voltage drop between the plug and block is substantially reduced. The detent 69 snaps into an annular groove II between the tapered tip of the plug I and the shank portion 4, making a yielding but secure engagement between the plug and the block. The block 65 may terminate at its other end in a metallic spring pressed contact 12 for contacting, for example, with a central contact on a lamp base (not shown). A structure similar to that shown in Figure 1 is more fully described and claimed in my copending application Serial Number 713,? 13 filed March 2, 1934. I

The wire terminal instead of being a plug as in the exemplification heretofore described, may be a spring jack adapted to snap over the tapered tip of the plug I to provide a line connection between two electrical conductors, both of which are wires. In Figures l8, l9 and 20, I have shown such a spring jack 13 which may be bored as at 14 to receive the bared end of the wire 2 and counterbored as at 15 to receive the insulation 3, similarly to the bore and counterbore in the plug I. In the region of the bore I4 the external diameter of the jack is preferably reduced as at 16, in any convenient manner not necessary to be here described, and the wall of the jack at this point may be swaged in accordance with the present invention to produce the indentations 11 therein and the consequent reduction of the bore 14, as already described with respect to bore 6 of the plug I. The machine of my present invention may be employed for swaging the jack terminal 13, as well as the plug terminal I, by removing the plate I1 and inserting the jack I3 with its two semicylindrical complementary spring portions I8 and I9 over the mandrel which is located in a central bore 8| of the cylinder I9 adjacent the jaws 9 as shown in Figure 18. The mandrel 80 may be adjustably retained against axial movement by a head 82 on the mandrel, threaded in a counterbore 83 in the bore 8| and locked. in position by a nut 84 which abuts the cylinder I9. The head 82 may have a kerf 86 in its outer end, so that it may be adjusted in position by a screw-driver.

To position the jack 13 for swaging at the proper point the mandrel 80 has a shoulder against which the end of the jack 13 abuts.

As shown in Figure 20, the spring jack 13 may receive the plug terminal I, the semi-annular internal ribs 89 and 90 on the spring portions 18 and I9, respectively, of the jack I3, snapping over the tapered tip of the plug I and being yieldingly retained in the annular groove II in the plug by the inherent resiliency of the spring portions I8 and 19, which function in some respects similarly to the spring pressed detent 69 of the block 65 shown in Figure 1.

It will be observed that I have provided means for placing a relatively great pressure upon the terminal and wire from four points, together with automatic means for insuring that the pressure at each point shall be equal, so that the terminal and wire will be welded, so to speak, into an almost integral coupling, and I accomplish this without danger of breaking or weakening the metal of the parts by applying the pressure from all four points at the same time and at the same rate of speed.

Furthermore, I have provided means for insuring that the pressure on different terminals and wires will be the same so that the relative extent of deformation will be equal. It frequently happens in practice that in stripping the insulation from the stranded wire, for example, some of the strands will be broken ofi. In that case the wire will fit more loosely in the bore of the plug and the jaws must move inwardly a greater distance to form the desired integral coupling between the plug and the wire. By the means which I have provided, as already explained, this desirable result is automatically attained in a device which is very rigid, very accurate in its movements, and capable of applying tremendous pressure. The means I have provided also function satisfactorily when a plurality of conductors are inserted into the terminal.

Obvously, the invention is not limited to the details of construction here shown for purposes of exemplification. Furthermore, it is not essential that all of the elements of the invention be used conjointly, since various combinations and sub-combinations may be advantageously employed. Particularly, while I have shown the jaws 9 as provided with V-edges 26 which are straight-sided, the sides of the V may be concave, and also, the tip of the V may be truncated, so that the jaws are blunt-pointed instead of sharppointed.

I claim:

1. In a mechanism of the class described, the combination of radially movable complementary jaws directed toward a common center and in a common plane; a fixed cylinder concentric with said center; slots in the cylinder slidingly receiving said jaws; a guide plate fixed to said cylinder and having portions spaced apart therefrom, said jaws sliding between said cylinder and guide plate; an aperture in said guide plate concentric with said center; an annular cam rotatable on said cylinder and having its inner periphery engageable with the outer ends of said jaws; cam surfaces on said periphery engageable with said outer ends to move the jaws inwardly upon rotation of the cam in one direction; a spring individual to each jaw for urging the jaw to outer-v most position upon rotation of the cam in the opposite direction; means for rotating the cam; a rotatable arm; a plunger articulated with said arm; a sleeve closed at one end and open at the other, said plunger passing slidingly through the 2,002,220 closed end of the sleeve; a head'on the plunger within said sleeve; a coil spring surrounding said plunger between. said head and said closed end;

a block thr'eadedly received in said open end; a rod fixed to said block; a fixed spring barrel receiving said rod therethrough; another coil spring between said block and said spring barrel for urging the rod in one direction; and a treadle articulated with the rod for urging it in the opposite direction.

2. In a swaging machine for uniting a metallic electrical terminalnipon a conductor wire received therein, the combination of a stationary support, a plurality of more than two pointed jaws directed toward a common center and mounted for radial movement upon said support, an annulus rotatably mounted upon said support encircling the jaws and having inturned cam surfaces engaging the outer ends of the jaws to move them simultaneously toward the said center upon rotation of the annulus in one direction, an oper-. ating arm extending radially from the annulus, a foot operated treadle for applying manual power, a link connecting the arm and treadle for transmitting power to advance the jaws to engage the terminal, yielding means upon the link operative upon the jaws encountering a predetermined resistance to allow further movement of the treadle in the same direction without impartng further movement to the jaws.

3. The structure of claim 2 including spring means individual to each jaw for moving the jaws outwardly of said center upon rotation of the annulus in the opposite direction and means imparting a counter rotation to the annulus upon release of the treadle. 1

4. The structure of claim 2 wherein additional means is provided to return the annulus to open the jaws upon release of the treadle.

5. The method of afiixing a metallic sleeve to metallic conductor means, comprising: disposing the conductor means in position in the sleeve, and swaging in the sleeve simultaneously at a plurality of places spaced about the periphery of the sleeve, by driving a plurality of pointed dies into the sleeve at those places, forging localized sections of the sleeve ahead of said dies, producing a force on the underlying metal of said sections causing a flow of the irmer metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid cross-section.

6. The method of afl'ixing a metallic sleeve to metallic conductor means, comprising: disposing the conductor means in position in the sleeve, and swaging in the sleeve simultaneously at at lease three places spaced about the periphery of the sleeve, by driving at least three pointed dies into the sleeve at those places, forging localized sections of the sleeve ahead of said dies, producing a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid cross-section.

'7. The method of affixing a metallic sleeve to metallic conductor means, comprising: disposing the conductor means in position in the sleeve, and swaging in the sleeve simultaneously at at least three places spaced about the periphery of the. sleeve, by driving at least three pointed dies into the sleeve at those places, forging localized sections of the sleeve ahead of said dies, producing a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sectionsremaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid crosssection, with the cross-section of said conductor means at said plane in the form of a polygon having sides equal in number to the number of said dies.

8. A machine for aflhiing a metallic sleeve to,

metallic conductor means, comprising: supporting means, leaving space for a sleeve having conductor means positioned therein; a plurality of pointed swaging dies, mounted in said supporting means for relative movement simultaneously against a plurality of places on the sleeve spaced about the periphery of the sleeve, and operable on advancement thereof to drive into the sleeve at those places, to forge localized sections of the sleeve ahead of said dies,to produce a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid cross-section; and actuating means for said dies, operable to effect such advancement of said dies.

9. A machine for afiixing a metallic sleeve to metallic conductor means, comprising: supporting means, leaving space for a sleeve having conductor meanspositioned therein; at least three pointed swaging dies, mounted in said support ing means for relative movement simultaneously against at least three places on the sleeve spaced about the periphery of the sleeve, and operable on advancement thereof to drive into the sleeve at those places, to forge localized sections of the sleeve ahead of said dies, to produce a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid cross-section; and actuating means for said dies,,operable to effect such advancement of said dies.

10. A machine for a metallic sleeve to metallic conductor means, comprising: supporting means, leaving space for a sleeve having conductor means positioned therein; at least porting means for relative movement simultaneously against at least three places on the sleeve spaced about the periphery of the sleeve, and operable on advancement thereof to drive into the sleeve at those places, to forge localized sections of the sleeve ahead of said dies, to produce a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid cross-section with the cross-section of said conductor means atsaid plane in the form of a polygon having sides equal in number to the number of saiddies; and actuating means for said dies, operable to effect such advancement of said dies.

11. A machine for affixing a metallic sleeve to metallic conductor means, comprising: supporting means, leaving space for a sleeve having conductor means positioned therein; a plurality of pointed swaging dies, mounted in said supporting means for relative movement simultaneously against a plurality of places 'on the sleeve spaced about the periphery of the sleeve, and operable o'n advancement thereof to drive into the sleeve at those places, to forge localized sections of the sleeve ahead of said dies, to produce a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward fiow, to forge the sleeve and the conductor means at the plane of said sections into a solid crosssection; and actuating means for said dies, operable to effect such advancement of said dies; and means for limiting the amount of force said actuating means may apply to said dies for driving said dies into the sleeve, to prevent appli'-' cation of excessive'force likely to split the'sleeve.

12. A machine for aflixing a metallic sleeve to metallic conductor means, operable to afllx a sleeve of any one of various cross-sectional areas to conductor means of any one of various crosssectional areas, comprising: supporting means, leaving space for a sleeve having conductor means positioned therein; a plurality of pointed swaging dies, mounted in said supporting means for relative movement simultaneously against a plurality of places on the sleeve spaced about the periphery of the sleeve, and operable on advancement thereof to drive into the sleeve at those places, to forge localized sections of the sleeve ahead of said dies, to produce a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as -said actuating means advances said dies the distance requisite to forge the sleeve and the conductor means into a. solid cross-section at the plane of said sections.

13. A machine for afiixing a metallic sleeve to metallic conductor means, comprising: support ing means, leaving space for a sleeve havingconductor means positioned therein; a plurality of pointed swaging dies, mounted in said supporting meansfor relative movement simultaneously against a pluralityof places on the sleeve spaced about the periphery of the sleeve, and operable on advancement thereof to drive into the sleeve at thoseplaces to forge localized sections of the sleeve ahead of said dies, to produce a force on the underlying metal of said sections causing a flow of the inner metal of the sleeve with the outer portions of the sleeve intermediate said sections remaining substantially static as respects any substantial outward flow, to forge the sleeve and the conductor means at the plane of said sections into a solid cross-section; an operating member for said dies, having a normal position in which said dies are retracted to a predetermined position; means for transmitting force to said operating member to thereby advance said dies; stress limiting means associated with said force transmitting means for limiting the stress which may be applied to said dies to advance said dies, while permitting said dies to continue to act against the sleeve after said stress limiting means limits said stress; and means for adjusting said stress limiting means,

while leaving said operating member in its normal position.

HARRY A. DOUGLAS.

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